说明：  一种比较好用的边缘检测方法CORNER Find corners in tensity image. ％ CORNER works by the following step: ％ 1. Apply the Canny edge detector to the gray level image and obtain a ％ binary edge-map. ％ 2. Extract the edge contours from the edge-map, fill the gaps in the ％ contours. ％ 3. Compute curvature at a low scale for each contour to retain all ％ true corners. ％ 4. All of the curvature local maxima are considered as corner ％ candidates, then rounded corners and false corners due to boundary ％ noise and details were eliminated. ％ 5. End points of line mode curve were added as corner, if they are not ％ close to the above detected corners.
(A more useful edge detection method CORNER Find corners in tensity image. CORNER works by the following step: 1. Apply the Canny edge detector to the gray level image and obtain a binary edge-map. 2. Extract the edge contours from the edge-map, fill the gaps in the contours. 3. Compute curvature at a low scale for each contour to retain all true corners. 4. All of the curvature local maxima are considered as corner candidates, then rounded corners and false corners due to boundary noise and details were eliminated. 5. End points of line mode curve were added as corner, if they are not close to the above detected corners.)